round button css
.button {
background-color: #4CAF50;
border: none;
color: white;
padding: 20px;
text-align: center;
text-decoration: none;
display: inline-block;
font-size: 16px;
margin: 4px 2px;
}
.button1 {border-radius: 2px;}
.button2
{border-radius: 4px;}
.button3 {border-radius: 8px;}
.button4
{border-radius: 12px;}
.button5 {border-radius: 50%;}